US to Germany Ring Size

Enter a US size to find its German diameter equivalent (e.g. 16.5, 17.0, 18.0), or scan the complete comparison table below.

Need to convert in reverse? Go to Germany to US Ring Size Converter →

Common US to Germany equivalents

These examples share the same inner diameter. Use the calculator for another size or an in-between measurement.

US 5 corresponds to Germany 15.5 at 15.7 mm.
US 7 corresponds to Germany 17.5 at 17.32 mm.
US 9 corresponds to Germany 19 at 18.95 mm.

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Numeric size (e.g. 8) for US/Canada, EU, or Japan — or a letter size (e.g. P 1/2) for UK/Australia.

Converting US numbers to German millimeter diameter sizes

German jewelers (and many across Austria, Switzerland, and the Netherlands) label rings directly by their inside diameter in millimeters (e.g., German size 16.5 corresponds to 16.5 mm inside diameter). A US size 6 equals German size 16.5, US size 7 equals German size 17.3, and US size 8 equals German size 18.1.

US to Germany reference table

US to Germany ring size conversion
US / CanadaUS, CA, MX	Germany / NetherlandsDE, NL	Diameter (mm)
US / CanadaUS, CA, MX3	Germany / NetherlandsDE, NL14	Diameter (mm)14.07
US / CanadaUS, CA, MX3.5	Germany / NetherlandsDE, NL14.5	Diameter (mm)14.48
US / CanadaUS, CA, MX4	Germany / NetherlandsDE, NL15	Diameter (mm)14.88
US / CanadaUS, CA, MX4.5	Germany / NetherlandsDE, NL15.5	Diameter (mm)15.29
US / CanadaUS, CA, MX5	Germany / NetherlandsDE, NL15.5	Diameter (mm)15.7
US / CanadaUS, CA, MX5.5	Germany / NetherlandsDE, NL16	Diameter (mm)16.1
US / CanadaUS, CA, MX6	Germany / NetherlandsDE, NL16.5	Diameter (mm)16.51
US / CanadaUS, CA, MX6.5	Germany / NetherlandsDE, NL17	Diameter (mm)16.92
US / CanadaUS, CA, MX7	Germany / NetherlandsDE, NL17.5	Diameter (mm)17.32
US / CanadaUS, CA, MX7.5	Germany / NetherlandsDE, NL17.5	Diameter (mm)17.73
US / CanadaUS, CA, MX8	Germany / NetherlandsDE, NL18	Diameter (mm)18.14
US / CanadaUS, CA, MX8.5	Germany / NetherlandsDE, NL18.5	Diameter (mm)18.54
US / CanadaUS, CA, MX9	Germany / NetherlandsDE, NL19	Diameter (mm)18.95
US / CanadaUS, CA, MX9.5	Germany / NetherlandsDE, NL19.5	Diameter (mm)19.35
US / CanadaUS, CA, MX10	Germany / NetherlandsDE, NL20	Diameter (mm)19.76
US / CanadaUS, CA, MX10.5	Germany / NetherlandsDE, NL20	Diameter (mm)20.17
US / CanadaUS, CA, MX11	Germany / NetherlandsDE, NL20.5	Diameter (mm)20.57
US / CanadaUS, CA, MX11.5	Germany / NetherlandsDE, NL21	Diameter (mm)20.98
US / CanadaUS, CA, MX12	Germany / NetherlandsDE, NL21.5	Diameter (mm)21.39
US / CanadaUS, CA, MX12.5	Germany / NetherlandsDE, NL22	Diameter (mm)21.79
US / CanadaUS, CA, MX13	Germany / NetherlandsDE, NL22	Diameter (mm)22.2